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Home >> Hyundai >> 2017 >> Veloster Base, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 3) - 1.6L GDI >> DTC P0300: Random/Multiple Cylinder Misfire Detected >> System Inspection >> Compression Pressure Check
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Compression Pressure Check

  1. Warm up the engine to normal operating temperature.
  2. Disconnect the spark plug cables. And remove the spark plugs and fuel pump relay.
  3. Crank the engine to remove any foreign material in the cylinders.
  4. Put compression pressure gauge into spark plug hole.
  5. Check compression pressure at each cylinder.

    Specification:  Approx. 15kg/cm2

  6. Is compression pressure for each cylinder displayed within specifications?

    YES 

    • Go to "Ignition system check" procedure below.

    NO 

    • Add a small amount of oil through the spark plug hole, and repeat above steps. If the addition of oil causes the compression to rise, the cause is a worn or damaged piston ring or cylinder inner surface.
    • If the compression remains the same, the cause is a burnt or defective valve seat, or pressure is leaking from the gasket. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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